Aquarium



FIG. 1 is a front elevational view of an aquarium showing my new design, the rear being the same as the front shown;

FIG. 2 is a perspective view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a side elevational view thereof; the opposite side being the same as the side shown. 

CLAIM The ornamental design for an aquarium, as shown and described. 